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Right, they won't work in the 0 to 10 ppm range needed.I have two CO detectors/alarms in my home; the wall-mounted ones are pretty cheap, around $30. I had just assumed those wouldn't really work for scuba.
That would be good for a small fill shack, but the 0.5-1 L/min flow rate might be limiting for larger compressors. Analox gave a larger, more costly unit to the main fill shack in Cozumel, and the tank jockeys disabled the automatic shutoff.As far as the once-per-day checks, I decided to do 2-minutes of research and discovered you can get an inline model for about $500. Now, $500 might be a lot for an individual scuba-diver, but for fill-station that is CHEAP! Much better than demanding your potentially unreliable employees to check the CO 1-2x per day, which they'll probably skip. I retract my once-per-day idea as pretty silly.
One member here actually has a Sensorcon CO unit attached to his home compressor.
How fancy. The bag trap seems simpler to me, but since you have it, ok.Instead of dumping straight from the tank into the bag, I have an air-gun which attaches to a BCD hose in my save-a-dive-kit. That requires attaching some regulators of course, but maybe more reliable and less annoying than trying to control a bag and a tank-valve.
Plugin with battery backup is great. That page contradicts itself on whether it uses AA or 9V batteries, but either is fine. I don't know how accurate it is in the push-button lower range or where you saw that, but Kidde is a top brand.I also considered this wall-mount unit, it's about $30. I may still buy this unit for my home, because my other CO-alarms are just alarms, and have no display of CO-levels. In the normal mode, it won't show below 30ppm, but you can push a button and see below 30ppm. Anyone looking for something dual-use, I'd probably go with that model.
Yeah, it's a generic unit sold by many Asian sources. There was another one linked on that page for $7 less, but they're all cheap. I question how long 3 AAAs would last in the always-on function, so let us know when you test it. I see that it claims a three-year sensor life, but I would write the purchase date on the back with an indelible marker and replace it after a year.That said, I went with the "walmart" one you mentioned. Here's the Amazon link for anyone else who might be interested. Reviews seem to suggest quality is "ok", not amazing, and it appears to be one of those generic devices that gets rebranded by a bunch of companies. That said, it is intended for "real time" monitoring, and intended for checking very low PPM levels, so it'll probably be better for quickly checking tanks.